V limas :1/3×luas alas×tinggi
luas alas: p×l
: 8×8
=64
V limas : 1/3×64×9
supaya mudah : 1/3×9×64
=192 cm
V balok :p×l×t
: 8×8×7
= 448 cm^3
V gabungan :V limas +V balok
: 192 + 448
= 640
jadi jawabnya d.640
maaf kalau salah
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V limas :1/3×luas alas×tinggi
luas alas: p×l
: 8×8
=64
V limas : 1/3×64×9
supaya mudah : 1/3×9×64
=192 cm
V balok :p×l×t
: 8×8×7
= 448 cm^3
V gabungan :V limas +V balok
: 192 + 448
= 640
jadi jawabnya d.640
maaf kalau salah